No, it isn't. You have two master
servers. Both servers replicate the other one. like master1
<=> master2. If you have a problem with master1, the loadbalancer
switch to master2. All changes shall be written to the master2. If the master1
is still alive again, the master2 replicate (if slurpd) all the changes to
master1. So this master is updated and can work as
befor.